<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <style>
      [v-cloak] {
        display: none;
      }
    </style>
  </head>

  <body>
    <div id="app">
      <!-- <div v-pre>{{msg}}</div> -->
      <!-- <div v-cloak>{{msg}}</div> -->
      <div v-once>第一次绑定的值：{{count}}</div>
      <div>
        <input type="text" v-model="count" />
      </div>
    </div>

    <script>
      let app = new Vue({
        el: '#app',
        data: {
          msg: 'HelloWorld',
          count: 10
        }
      })
    </script>
  </body>
</html>
